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International Linear Collider; transverse beam polarization.

The top polarization at the International Linear Collider (ILC) with transverse beam polarization is utilized in the $e^{+} e^{-} \rightarrow t\bar{t}$ process to probe interactions of the scalar and tensor type beyond the Standard Model and to disentangle their individual contributions. Confidence level limits of 90% are presented on the interactions with realistic integrated luminosity and are found to improve by an order of magnitude compared to the case when the spin of the top quark is not measured. Sensitivities of the order of a few times $10^{−3}$ TeV^-2 for real and imaginary parts of both scalar and tensor couplings at $\sqrt{s} = 500$ and 800 GeV with an integrated luminosity of 500 fb^-1 and completely polarized beams are shown to be possible.

B Ananthanarayan¹ Monalisa Patra¹ Saurabh D Rindani²

1. Centre for High Energy Physics, Indian Institute of Science, Bangalore 560 012, India
2. Theoretical Physics Division, Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India

Published

November 2012